What comprises the ocean crust?
A)sedimentary rocks
B)peridotite
C)igneous rocks
D)metamorphic rocks
E)granite
C
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Which of the following is true regarding fuel cell technology?
A. They are only about 40-45% efficient. B. They must receive a constant supply of water and oxygen. C. They must be recharged with an electrical current. D. They were first designed by NASA. E. A fuel cell stack providing all of the electricity for a typical home is not feasible because it would be too large.
Most present?day fisheries managers ________
A) favor taxes on commercial fishing boats B) favor protection of commercially valuable species and not others C) favor short?term solutions to marine ecosystem problems D) wish to set aside areas of ocean where systems can function without human interference E) want all laws regarding fishing to be abolished
Which of the following best matches the description?Optimum number of individuals of a species that can be supported in an area over an extended period of time.
A. emigration B. age distribution C. K-strategist D. carrying capacity E. r-strategist F. population density G. death phase H. immigration I. exponential growth phase J. density-independent factor K. lag phase L. environmental resistance M. biotic potential N. density-dependent limiting factor O. dispersal P. stable equilibrium phase
The solar energy reaching Earth travels a distance of ________ million kilometers through the vacuum of space
A) 1 B) 8 C) 30 D) 150 E) 567